Background

Minerva ships various styles that improve templates for mobile-devices and the night mode theme. We want to start using these on Vector 2022.

User story

As an interface admin I want to benefit from styles shipped by the WMF to reduce the amount of work I have to do to maintain my wiki.

Requirements

• A new ResourceLoader module exists in WikimediaMessages.
• The module should be associated with a dynamic module SiteAdminHelperModule.php that is inspired by SkinModule in core and allows site admins to disable style packages via a MediaWiki message. This will be done by the message wikimedia-styles-exclude which by default is empty but accepts a pipe separated list of feature names to disable.
• The initial version should contain all the styles that are currently enabled in Minerva.
• The module can be added to any skin via a configuration flag.
• By default the module is not added to any skin (this allows us to migrate this bit by bit) e.g. mw.loader.getState('ext.wikimediamessages.styles') === 'registered'

QA steps

To be tested by a developer.

• No visual changes expected on Pixel.
• Initially the module should not be loaded by any skins (deployment will come later)
• If I edit MediaWiki:wikimedia-styles-exclude and change it to "theme-night|theme-night-mainpage" it should disable all the styles.

In beta

• Confirm https://en.m.wikipedia.beta.wmflabs.org/w/load.php?modules=ext.wikimediamessages.styles generates a non-empty CSS file and is not loaded on an article page.

In production:

• @Edtadros will confirm https://en.m.wikipedia.org/w/load.php?modules=ext.wikimediamessages.styles generates a non-empty CSS file and is not loaded on an article page and mark as Verified.

Communication criteria - does this need an announcement or discussion?

Not yet.

QA Results - Prod